Hey dzo, i have managed to back up the user folder from the mrz0047. The generic testmode key worked like a charm. As per your instructions i have zipped the LANGDATA and MENU folders from PRG0 and PRG1. Here are the zip files. Kindly see what you can do with these. Any effort i truly appreciate.
OK, the language strings are similar to the old verson of mrz99 (but not the same).
Here's a new NA090JPJPN.LNG that should work. Just replace the old one in either PRG0/LANGDATA or PRG1/LANGDATA depending on the existence of PRG.FLG (if it exists in /USER use PRG1).
The images are a bit trickier, they are completely different, It'll take me a while to make an image file.
edit: I've taken a look at the images and it would be a lot of work to redo them because it uses a dark background while mrz99 has a light one. You'll have make do with the original images.